A few things about Canon you should understand. First off they won't ever release a feature that has not been put through the ringer a million times over and even after developing and more testing into the 99% perfect function of the feature they still would not release it to the public until that one feature works without pause or problem to anything else 100%. There are limits in todays tech that won't be around in tomorrows tech, there are limits one simply can not get around nomatter how much they try. When it comes to overheating, there may not be all that much humanly possible today in a small body they can do without the guarantee the feature won't harm other parts of the body. For example if they could engineer the sensor to not over heat but the amount of heat still causes a shorter life span on a single weather seal in the body then Canon will not do it! You would not believe the amount of people completely outside Canon Corp that are paid to test every single little thing in a body, then test that one thing to how it long term affects every other part or feature in the body, years and years go into their pro level stuff. This is why they are the top patent filer, it's because all the work that goes into every little detail to work 100%.Absolutely. Just like those who think Canon can’t engineer uncropped 4K in a 5DIV or 1080 120p in a mirrorless camera without overheating.
Canon can engineer what they want, but what they want centers around protecting profitability, product lines and dependability, mostly the former two motivations.
Second thing you should know is most of Canon's bodies don't make much profit for them. The 7d2, 5d4, 5ds/r, and 1d bodies are not profitable machines, sometimes they may just break even also. The reason is these are not here to make them rich at all. If you seen the cost of producing, testing, aligning and more testing each mirror mechanism in a 1dx alone you would say it's silly to even sell the camera to the public at any cost. Canons bread and butter are printers, then entry level SLR stuff. These are the products that pay the bills and pay for all the advancements and R&D into the five bodies i mentioned above. Canon has 6 entry level or mid level bodies on the market just to make their higher lines that much better in terms of working all the time. So when a body of a higher model line comes out without a feature you think should be in it, it is not them protecting their profit at all, it is them protecting you from a possible headache of it not working they way it should when you are in the field and your paycheck depends on it. This is what separates Canon from the other makers, Though Nikon does a decent amount of testing but Sony barely does anything much in comparison to Canon. This is why Nikon has the release dates not being met or problems with the first/second or more production lines, this is why Sony just jams in the latest features without any care of it working perfect, jam the features in the body and sell baby sell. To Canon HQ people in Japan it is there name, their honor, their life meaning that the Camera works as intended and they will never chance that being harmed. Luckily for them the millions of people buying silly entry level slr's today will be the future buyers of the higher line bodies tomorrow because by them those people will know Canon always works the way it should.